CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.
As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
i
An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen
-
1990
-
Series: Mining Publications
Details:
-
Personal Author:
-
Corporate Authors:
-
Description:"An improved method for preparing gravimetric standard gas mixtures of helium-4 in nitrogen has been developed by the U.S. Bureau of Mines. A single-pan 12-kg analytical balance that has a sensitivity of 3 mg is used to prepare the mixture. The balance will accommodate a cylinder having a volume of approximately 4 l that weighs approximately 5 kg. The method has been improved to a precision of +/-0.04 pct by performing four successive dilutions, by improved handling of gases in the manifold, and by using an improved analytical method to select high-purity gases." - NIOSHTIC-2
NIOSHTIC no. 10008167
-
Subjects:
-
Series:
-
Subseries:
-
Document Type:
-
Genre:
-
CIO:
-
Topic:
-
Location:
-
Pages in Document:7 numbered pages
-
NIOSHTIC Number:nn:10008167
-
Collection(s):
-
Main Document Checksum:
-
Download URL:
-
File Type: